The Advanced Bash Scripting Guide is both a reference and a tutorial on shell scripting. This comprehensive book, the equivalent of 1,000+ print pages, covers almost every aspect of shell scripting. It contains 382 profusely commented illustrative examples, a number of tables, and a cross-linked index/glossary. Not just a shell scripting tutorial, this book also provides an introduction to basic programming techniques, such as sorting and recursion. Included scripts are the Game of Life, a Perquackey variant, a Morse code trainer, and an implementation of the Gronsfeld Cipher. This book is suited for both individual study and classroom use. It covers Bash, up to and including version 4.2.
Note that users of miniaturized single-board computers
running Linux, such as the Raspberry Pi and the Beagle
Bone, would find this Guide useful for learning and running Bash scripts to explore and expand the capabilities of these small, but powerful machines.

Alkaline is a full-featured standalone search and index server. The spider is a fully remote indexing daemon which includes support for all standards like robots.txt and "skip" meta tags, and allows multiple distinct configurations and search groups (searching many different sites from your server), including complex regexp indexing paths, authentification, filters for various document formats, XML-based online management and statistics, mrtg-compatible perf numbers, and more.

Apsfilter is a magic printfilter, allowing you to print different document
types "automagically" without having to convert them manually into something
which is understood by your printer. Apsfilter is a mature and powerful
printing solution for any flavor of Unix running lpd or LPRng. It supports the
latest GhostScript version and 3rd-party printer drivers (such as hpijs, ijs,
hpdj, pcl3, and gimp-print). It autodetects lots of file, archive, and
compression types. It supports printing on local as well as on Appletalk, Unix,
and Windows remote printers. General and "per printer-queue" based config files
allow you to configure the printer for your needs. The lpr command line options
allow you to change printing parameters like print quality, orientation, duplex
mode, etc. "on the fly" without having to edit any config file. A SETUP script
helps you to test various supported ghostscript drivers prior installation,
makes the necessary entries in /etc/printcap, creates spool directories, and
creates apsfilter default config files as needed. A handbook in HTML is
available. Several tools are also included: "aps2file" allows you to print to a
file via apsfilter, "apspreview" previews files as generated by apsfilter using
gv and friends, and "apsfilter-bug" assists you in doing bug and problem
reports.

The Bahamut IRCD is based on the EFNet Hybrid IRCD
and has many additional features primarily
designed for the DALnet IRC network. Its features
include very high performance, compatibility with
Solaris, BSD and Linux and a high level of
stability under very high load, as well as many
improvements over the original EFNet code. Bahamut
is not compatible with Dreamforge as of version
1.2.0.

Balance is a simple but powerful generic TCP proxy
with round-robin load balancing and failover
mechanisms. Its behavior can be controlled at
runtime using a simple command line syntax.
Balance supports IPv6 on the listening side, which
makes it a very useful tool for IPv6 migration of
IPv4 only services and servers.

BitchX is the premiere IRC (Internet Relay Chat)
client. It originally was a modified version of
the popular ircII client, and the features were
eventually merged into the EPIC IRC client. The
current development is aimed at merging the client
back to a current branch of EPIC and bringing
compatibility and stability back to the client,
while bringing the features that are BitchX into a
new client.

C-Kermit is a combined serial and network communication software package offering a consistent, medium-independent, cross-platform approach to connection establishment, terminal sessions, file transfer, character-set translation, numeric and alphanumeric paging, and automation of communication tasks. Recent versions include FTP and HTTP clients as well as an SSH interface, all of which can be scripted and aware of character-sets. It supports built-in security methods, including Kerberos IV, Kerberos V, SSL/TLS, and SRP, FTP protocol features such as MLSD, and source-code parity with Kermit 95 2.1 for Windows and OS/2.

cgi-util is a fast, easy to use C library for creating CGI programs. Functions are available for initialization (parsing), grabbing fields (by string, integer, double or boolean value), embedding HTML files, and more. It accepts both POST and GET request methods and has extensive error handling.

DansGuardian is a Web content filtering proxy that uses Squid to do all the fetching. It filters using multiple methods including, but not limited to, phrase matching, file extension matching, MIME type matching, PICS filtering, and URL/domain blocking. It has the ability to switch off filtering by certain criteria including username, domain name, source IP, etc. The configurable logging produces a log in an easy to read format. It has the option to only log text-based pages, thus significantly reducing redundant information (such as every image on a page).